Ordering Numbers Up to 20

Henry and Skylar are visiting a friend that lives in a tall block of flats. But, there is a problem! A buffalo moved in and every time he stomps down the hall, the flat numbers fall off the doors! Now the numbers are all out of order and they can't find their friend! Let's learn about ordering numbers up to twenty to help! When we talk about order, we mean listing things in a certain way. When we count from one to twenty in ones, we have to say the numbers in a certain order. This is the order that the numbers go in. If you see the numbers in different places, it's called out of order. To help us order numbers up to twenty, we can use a number line as a guide. Let's show Skylar how to use a number line to order the door numbers from one to ten. Five flat numbers are on the floor. But some of the flats still have their numbers on their doors. Let's start by comparing the line of doors to a number line. Begin by matching them up. Then, find the first blank door and look at the number line below. The number line says two, so we need to find the number two and put it here. Now, move to the next blank door and check the number line below. The number line below says three, that means the number three will go here. Let's look at the next blank doors and check them with the number line below. The number line shows us that five belongs here, eight belongs here and ten belongs here. Let's put the numbers back in their places! Now that the numbers are all back in order, let's count them to check our work! One, two, three, four, five, six, seven, eight, nine, ten! Well done, Skylar! Now let's help Henry. These are the flats numbered eleven to twenty. Four of the flats have their numbers on the floor and six still have numbers on the doors. Let's check with a number line to find where each number belongs. Start by matching them up. Then find the blank doors and look for those places on the number line below. What numbers will we need? We will need eleven, thirteen, sixteen and nineteen! Now we can put the numbers back where they belong and count to make sure they are in the right order. Eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty! While Henry and Skylar find where their friend lives, let's review! Today we learned about ordering numbers to twenty by using a number line. First, put a number line below the list with missing numbers. Next, look at the missing spaces and compare them to the number line below. Then, write the correct numbers in their spots. Finally, count the order to check your work! "I'm glad we got everything sorted but this can't keep happening!" "You're right, Henry, I have an idea." "No more stomping down the hall now!"